@ lwjhere
Sorry for writing English. I searched the error and found here. I noticed that the aforementioned error is because of capitalization. Linux (and Mac) are sensitive to capitalization (like C family languages). The problem is that your extension looks for validate.js but the file name is actually Validate.js (note the letter V). To overcome this problem it is enough to use correct casing.

I am so excited with this nice extension. Home that our internet won't be filtered anymore in Iran China.

You can contact me with this email address: [email protected]
I would be pleased if I could help.